kernel/power/power.h

   1 #include <linux/suspend.h>
   2 #include <linux/suspend_ioctls.h>
   3 #include <linux/utsname.h>
   4 #include <linux/freezer.h>
   5 #include <linux/compiler.h>
   6
   7 struct swsusp_info {
   8         struct new_utsname      uts;
   9         u32                     version_code;
  10         unsigned long           num_physpages;
  11         int                     cpus;
  12         unsigned long           image_pages;
  13         unsigned long           pages;
  14         unsigned long           size;
  15 } __aligned(PAGE_SIZE);
  16
  17 #ifdef CONFIG_HIBERNATION
  18 /* kernel/power/snapshot.c */
  19 extern void __init hibernate_reserved_size_init(void);
  20 extern void __init hibernate_image_size_init(void);
  21
  22 #ifdef CONFIG_ARCH_HIBERNATION_HEADER
  23 /* Maximum size of architecture specific data in a hibernation header */
  24 #define MAX_ARCH_HEADER_SIZE    (sizeof(struct new_utsname) + 4)
  25
  26 extern int arch_hibernation_header_save(void *addr, unsigned int max_size);
  27 extern int arch_hibernation_header_restore(void *addr);
  28
  29 static inline int init_header_complete(struct swsusp_info *info)
  30 {
  31         return arch_hibernation_header_save(info, MAX_ARCH_HEADER_SIZE);
  32 }
  33
  34 static inline char *check_image_kernel(struct swsusp_info *info)
  35 {
  36         return arch_hibernation_header_restore(info) ?
  37                         "architecture specific data" : NULL;
  38 }
  39 #endif /* CONFIG_ARCH_HIBERNATION_HEADER */
  40
  41 /*
  42  * Keep some memory free so that I/O operations can succeed without paging
  43  * [Might this be more than 4 MB?]
  44  */
  45 #define PAGES_FOR_IO    ((4096 * 1024) >> PAGE_SHIFT)
  46
  47 /*
  48  * Keep 1 MB of memory free so that device drivers can allocate some pages in
  49  * their .suspend() routines without breaking the suspend to disk.
  50  */
  51 #define SPARE_PAGES     ((1024 * 1024) >> PAGE_SHIFT)
  52
  53 asmlinkage int swsusp_save(void);
  54
  55 /* kernel/power/hibernate.c */
  56 extern bool freezer_test_done;
  57
  58 extern int hibernation_snapshot(int platform_mode);
  59 extern int hibernation_restore(int platform_mode);
  60 extern int hibernation_platform_enter(void);
  61
  62 #else /* !CONFIG_HIBERNATION */
  63
  64 static inline void hibernate_reserved_size_init(void) {}
  65 static inline void hibernate_image_size_init(void) {}
  66 #endif /* !CONFIG_HIBERNATION */
  67
  68 extern int pfn_is_nosave(unsigned long);
  69
  70 #define power_attr(_name) \
  71 static struct kobj_attribute _name##_attr = {   \
  72         .attr   = {                             \
  73                 .name = __stringify(_name),     \
  74                 .mode = 0644,                   \
  75         },                                      \
  76         .show   = _name##_show,                 \
  77         .store  = _name##_store,                \
  78 }
  79
  80 #define power_attr_ro(_name) \
  81 static struct kobj_attribute _name##_attr = {   \
  82         .attr   = {                             \
  83                 .name = __stringify(_name),     \
  84                 .mode = S_IRUGO,                \
  85         },                                      \
  86         .show   = _name##_show,                 \
  87 }
  88
  89 /* Preferred image size in bytes (default 500 MB) */
  90 extern unsigned long image_size;
  91 /* Size of memory reserved for drivers (default SPARE_PAGES x PAGE_SIZE) */
  92 extern unsigned long reserved_size;
  93 extern int in_suspend;
  94 extern dev_t swsusp_resume_device;
  95 extern sector_t swsusp_resume_block;
  96
  97 extern asmlinkage int swsusp_arch_suspend(void);
  98 extern asmlinkage int swsusp_arch_resume(void);
  99
 100 extern int create_basic_memory_bitmaps(void);
 101 extern void free_basic_memory_bitmaps(void);
 102 extern int hibernate_preallocate_memory(void);
 103
 104 /**
 105  *      Auxiliary structure used for reading the snapshot image data and
 106  *      metadata from and writing them to the list of page backup entries
 107  *      (PBEs) which is the main data structure of swsusp.
 108  *
 109  *      Using struct snapshot_handle we can transfer the image, including its
 110  *      metadata, as a continuous sequence of bytes with the help of
 111  *      snapshot_read_next() and snapshot_write_next().
 112  *
 113  *      The code that writes the image to a storage or transfers it to
 114  *      the user land is required to use snapshot_read_next() for this
 115  *      purpose and it should not make any assumptions regarding the internal
 116  *      structure of the image.  Similarly, the code that reads the image from
 117  *      a storage or transfers it from the user land is required to use
 118  *      snapshot_write_next().
 119  *
 120  *      This may allow us to change the internal structure of the image
 121  *      in the future with considerably less effort.
 122  */
 123
 124 struct snapshot_handle {
 125         unsigned int    cur;    /* number of the block of PAGE_SIZE bytes the
 126                                  * next operation will refer to (ie. current)
 127                                  */
 128         void            *buffer;        /* address of the block to read from
 129                                          * or write to
 130                                          */
 131         int             sync_read;      /* Set to one to notify the caller of
 132                                          * snapshot_write_next() that it may
 133                                          * need to call wait_on_bio_chain()
 134                                          */
 135 };
 136
 137 /* This macro returns the address from/to which the caller of
 138  * snapshot_read_next()/snapshot_write_next() is allowed to
 139  * read/write data after the function returns
 140  */
 141 #define data_of(handle) ((handle).buffer)
 142
 143 extern unsigned int snapshot_additional_pages(struct zone *zone);
 144 extern unsigned long snapshot_get_image_size(void);
 145 extern int snapshot_read_next(struct snapshot_handle *handle);
 146 extern int snapshot_write_next(struct snapshot_handle *handle);
 147 extern void snapshot_write_finalize(struct snapshot_handle *handle);
 148 extern int snapshot_image_loaded(struct snapshot_handle *handle);
 149
 150 /* If unset, the snapshot device cannot be open. */
 151 extern atomic_t snapshot_device_available;
 152
 153 extern sector_t alloc_swapdev_block(int swap);
 154 extern void free_all_swap_pages(int swap);
 155 extern int swsusp_swap_in_use(void);
 156
 157 /*
 158  * Flags that can be passed from the hibernatig hernel to the "boot" kernel in
 159  * the image header.
 160  */
 161 #define SF_PLATFORM_MODE        1
 162 #define SF_NOCOMPRESS_MODE      2
 163 #define SF_CRC32_MODE           4
 164
 165 /* kernel/power/hibernate.c */
 166 extern int swsusp_check(void);
 167 extern void swsusp_free(void);
 168 extern int swsusp_read(unsigned int *flags_p);
 169 extern int swsusp_write(unsigned int flags);
 170 extern void swsusp_close(fmode_t);
 171 #ifdef CONFIG_SUSPEND
 172 extern int swsusp_unmark(void);
 173 #endif
 174
 175 struct timeval;
 176 /* kernel/power/swsusp.c */
 177 extern void swsusp_show_speed(ktime_t, ktime_t, unsigned int, char *);
 178
 179 #ifdef CONFIG_SUSPEND
 180 /* kernel/power/suspend.c */
 181 extern const char *pm_labels[];
 182 extern const char *pm_states[];
 183
 184 extern int suspend_devices_and_enter(suspend_state_t state);
 185 #else /* !CONFIG_SUSPEND */
 186 static inline int suspend_devices_and_enter(suspend_state_t state)
 187 {
 188         return -ENOSYS;
 189 }
 190 #endif /* !CONFIG_SUSPEND */
 191
 192 #ifdef CONFIG_PM_TEST_SUSPEND
 193 /* kernel/power/suspend_test.c */
 194 extern void suspend_test_start(void);
 195 extern void suspend_test_finish(const char *label);
 196 #else /* !CONFIG_PM_TEST_SUSPEND */
 197 static inline void suspend_test_start(void) {}
 198 static inline void suspend_test_finish(const char *label) {}
 199 #endif /* !CONFIG_PM_TEST_SUSPEND */
 200
 201 #ifdef CONFIG_PM_SLEEP
 202 /* kernel/power/main.c */
 203 extern int pm_notifier_call_chain(unsigned long val);
 204 #endif
 205
 206 #ifdef CONFIG_HIGHMEM
 207 int restore_highmem(void);
 208 #else
 209 static inline unsigned int count_highmem_pages(void) { return 0; }
 210 static inline int restore_highmem(void) { return 0; }
 211 #endif
 212
 213 /*
 214  * Suspend test levels
 215  */
 216 enum {
 217         /* keep first */
 218         TEST_NONE,
 219         TEST_CORE,
 220         TEST_CPUS,
 221         TEST_PLATFORM,
 222         TEST_DEVICES,
 223         TEST_FREEZER,
 224         /* keep last */
 225         __TEST_AFTER_LAST
 226 };
 227
 228 #define TEST_FIRST      TEST_NONE
 229 #define TEST_MAX        (__TEST_AFTER_LAST - 1)
 230
 231 extern int pm_test_level;
 232
 233 #ifdef CONFIG_SUSPEND_FREEZER
 234 static inline int suspend_freeze_processes(void)
 235 {
 236         int error;
 237
 238         error = freeze_processes();
 239         /*
 240          * freeze_processes() automatically thaws every task if freezing
 241          * fails. So we need not do anything extra upon error.
 242          */
 243         if (error)
 244                 return error;
 245
 246         error = freeze_kernel_threads();
 247         /*
 248          * freeze_kernel_threads() thaws only kernel threads upon freezing
 249          * failure. So we have to thaw the userspace tasks ourselves.
 250          */
 251         if (error)
 252                 thaw_processes();
 253
 254         return error;
 255 }
 256
 257 static inline void suspend_thaw_processes(void)
 258 {
 259         thaw_processes();
 260 }
 261 #else
 262 static inline int suspend_freeze_processes(void)
 263 {
 264         return 0;
 265 }
 266
 267 static inline void suspend_thaw_processes(void)
 268 {
 269 }
 270 #endif
 271
 272 #ifdef CONFIG_PM_AUTOSLEEP
 273
 274 /* kernel/power/autosleep.c */
 275 extern int pm_autosleep_init(void);
 276 extern int pm_autosleep_lock(void);
 277 extern void pm_autosleep_unlock(void);
 278 extern suspend_state_t pm_autosleep_state(void);
 279 extern int pm_autosleep_set_state(suspend_state_t state);
 280
 281 #else /* !CONFIG_PM_AUTOSLEEP */
 282
 283 static inline int pm_autosleep_init(void) { return 0; }
 284 static inline int pm_autosleep_lock(void) { return 0; }
 285 static inline void pm_autosleep_unlock(void) {}
 286 static inline suspend_state_t pm_autosleep_state(void) { return PM_SUSPEND_ON; }
 287
 288 #endif /* !CONFIG_PM_AUTOSLEEP */
 289
 290 #ifdef CONFIG_PM_WAKELOCKS
 291
 292 /* kernel/power/wakelock.c */
 293 extern ssize_t pm_show_wakelocks(char *buf, bool show_active);
 294 extern int pm_wake_lock(const char *buf);
 295 extern int pm_wake_unlock(const char *buf);
 296
 297 #endif /* !CONFIG_PM_WAKELOCKS */